I have heard the reports of benifits from using dc on your filaments and would like to experiment with such. I wish to build a seperate filament supply to send some dc to my heaters. As being an "electrician" by trade, I have access to sealed storage batteries that could be used to supply pure dc. However, this would entail alot of charging in between "gigs". I need some help if anyone has a schematic of something simple in the way of a dc filament supply and I dont need anything real fancy. Just pure dc thats all. Any suggestions or a scematic would be excellent! Thanks everyone. The DOC

It all depends ... (don't you just hate answers like this?) ... on how much current you're thinking of. If it's the early voltage amplification stages only, which is where DC heating is likely to do the most good, then (assuming 6.3v heaters) you probably need around 1 amp max.

A low voltage drop SS bridge rectifier from a 6.3v secondary winding, followed by a big capacitor (say 10,000 uF), could be all you need. You can try modelling this with PSUD2. If you find you're getting a bit too much voltage, try putting a forward-biased diode or two in series with the output.

I have on hand a 6.0-0-6.0 center tapped transformer rated at 3a, and would like to be able to use it as part of my filament supply, at least for my driver stages. Could I use this in my filament circuit? Hey geek, thanks for the input as well.! What are the specs on the transformer you are using in that circuit? I would like to e-mail you about this design so drop me a line at aaronevans420@yahoo.com if you have time. If I can use this transformer I have, what kind of rect and filter should I use? What about using a choke in the filter section? I know I have alot of questions, but you guys really make life a little easier sometimes. Thanks to all.
The Doc.